package org.orqlog.client;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import org.orqlog.encoder.JSONSerializer;
import org.orqlog.encoder.RpcEncoder;
import org.orqlog.encoder.RpcRequest;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class RpcConsumer {

    //创建线程池对象
    private static ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    private UserClientHandler userClientHandler;

    private String host;
    private  int port;

    public RpcConsumer(String hostPort) {
        System.out.println(">>> connect to: " + hostPort);
        String[] s = hostPort.split(":");
        this.host = s[0];
        this.port = Integer.parseInt(s[1]);
    }

    //1.创建一个代理对象 providerName：UserService#sayHello are you ok?
    public Object createProxy(final Class<?> serviceClass) {
        //借助JDK动态代理生成代理对象
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(), new Class<?>[]{serviceClass}, new InvocationHandler() {
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                //（1）调用初始化netty客户端的方法

                if (userClientHandler == null) {
                    try {
                        initClient();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

                // 设置参数
                userClientHandler.setPara((RpcRequest) args[0]);

                // 去服务端请求数据
                return executor.submit(userClientHandler).get();
            }
        });
    }



        //2.初始化netty客户端
        public  void initClient() throws InterruptedException {
            userClientHandler = new UserClientHandler();

            EventLoopGroup group = new NioEventLoopGroup();

                Bootstrap bootstrap = new Bootstrap();
                bootstrap.group(group)
                        .channel(NioSocketChannel.class)
                        .option(ChannelOption.TCP_NODELAY, true)
                        .handler(new ChannelInitializer<SocketChannel>() {
                            protected void initChannel(SocketChannel ch) throws Exception {
                                ChannelPipeline pipeline = ch.pipeline();
//                            pipeline.addLast(new StringEncoder());
//                                pipeline.addLast(new NettyClientHandler());
                                pipeline.addLast(new RpcEncoder(RpcRequest.class, new JSONSerializer()));
                                pipeline.addLast(new StringDecoder());
                                pipeline.addLast(userClientHandler);
                            }
                        });


                bootstrap.connect(host, port).sync();
        }


    }
